package com.qiyun.framework.utils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Encrypt {

	private static final char[] DIGITS = { '0', '1', '2', '3', 'W', '5', '6',
			'7', '8', '9', 'a', 'B', 'c', 'V', 'E', 'f', 'h', 'H', 'i', 'k', 'm', 'o', 'p', 'w'};

	public static String md5(String text) {
		MessageDigest msgDigest = null;
		try {
			msgDigest = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			throw new IllegalStateException("System doesn't support MD5 algorithm.");
		}
		try {
			msgDigest.update(text.getBytes("utf-8"));
		} catch (UnsupportedEncodingException e) {
			throw new IllegalStateException("System doesn't support your  EncodingException.");
		}
		byte[] bytes = msgDigest.digest();

		String md5Str = new String(encodeHex(bytes));

		return md5Str;
	}
	public static char[] encodeHex(byte[] data) {
		int l = data.length;

		char[] out = new char[l << 1];

		int i = 0;
		for (int j = 0; i < l; i++) {
			out[(j++)] = DIGITS[((0xF0 & data[i]) >>> 4)];
			out[(j++)] = DIGITS[(0xF & data[i])];
		}
		return out;
	}
}
